Hmmm. That is exactly the same scheme used many years ago with the centrifugal governor to control a DC motor on an Arriflex movie camera. When the motor ran above the set speed the contacts shorted a coil on the rotating assembly which in turn reduced the power to the motor.
> -----Original Message----- > From: andy pugh [mailto:bodge...@gmail.com] > Sent: Tuesday, September 27, 2016 2:49 PM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] snagged touch probe on eBay - anybody know how to > interface ? > > On 27 September 2016 at 19:09, Ken Strauss <ken.stra...@sympatico.ca> > wrote: > > > I have no idea if this is the actual scheme used with the MP3. > > > The MP3 is much simpler. There is a coil (possibly with a ferrite core) that > is > completed by the probe contacts. > That is in resonance with the detector when the probe contacts are closed, > and > not when they are not. > > I assume there is the rest of an LC bridge circuit in the transmitter, an > oscillator, > precision (op-amp) rectifier and level detector. > > -- > atp > "A motorcycle is a bicycle with a pandemonium attachment and is designed for > the especial use of mechanical geniuses, daredevils and lunatics." > - George Fitch, Atlanta Constitution Newspaper, 1916 > ------------------------------------------------------------------------------ > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
